单项选择题

A compass card without north-seeking capability that is used for relative bearings is a(n)（）.

A.bearing circle
B.pelorus
C.bearing bar
D.alidade

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单项选择题
At the master gyrocompass，the compass card is attached to the（）.

A.spider element
B.sensitive element
C.link arm
D.pickup transformer
单项选择题
Before switching on gyro-compass，you should make sure that the power supply on board is（）.

A.high or low
B.AC or DC
C.strong or weak
D.on or off
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